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- // Copyright 2011 Google Inc. All Rights Reserved.
- //
- // Use of this source code is governed by a BSD-style license
- // that can be found in the COPYING file in the root of the source
- // tree. An additional intellectual property rights grant can be found
- // in the file PATENTS. All contributing project authors may
- // be found in the AUTHORS file in the root of the source tree.
- // -----------------------------------------------------------------------------
- //
- // CPU detection
- //
- // Author: Christian Duvivier (cduvivier@google.com)
- #include "./dsp.h"
- #if defined(__ANDROID__)
- #include <cpu-features.h>
- #endif
- //------------------------------------------------------------------------------
- // SSE2 detection.
- //
- // apple/darwin gcc-4.0.1 defines __PIC__, but not __pic__ with -fPIC.
- #if (defined(__pic__) || defined(__PIC__)) && defined(__i386__)
- static WEBP_INLINE void GetCPUInfo(int cpu_info[4], int info_type) {
- __asm__ volatile (
- "mov %%ebx, %%edi\n"
- "cpuid\n"
- "xchg %%edi, %%ebx\n"
- : "=a"(cpu_info[0]), "=D"(cpu_info[1]), "=c"(cpu_info[2]), "=d"(cpu_info[3])
- : "a"(info_type));
- }
- #elif defined(__i386__) || defined(__x86_64__)
- static WEBP_INLINE void GetCPUInfo(int cpu_info[4], int info_type) {
- __asm__ volatile (
- "cpuid\n"
- : "=a"(cpu_info[0]), "=b"(cpu_info[1]), "=c"(cpu_info[2]), "=d"(cpu_info[3])
- : "a"(info_type));
- }
- #elif defined(_MSC_FULL_VER) && _MSC_FULL_VER >= 150030729 // >= VS2008 SP1
- #define GetCPUInfo(info, type) __cpuidex(info, type, 0) // set ecx=0
- #elif defined(WEBP_MSC_SSE2)
- #define GetCPUInfo __cpuid
- #endif
- // NaCl has no support for xgetbv or the raw opcode.
- #if !defined(__native_client__) && (defined(__i386__) || defined(__x86_64__))
- static WEBP_INLINE uint64_t xgetbv(void) {
- const uint32_t ecx = 0;
- uint32_t eax, edx;
- // Use the raw opcode for xgetbv for compatibility with older toolchains.
- __asm__ volatile (
- ".byte 0x0f, 0x01, 0xd0\n"
- : "=a"(eax), "=d"(edx) : "c" (ecx));
- return ((uint64_t)edx << 32) | eax;
- }
- #elif defined(_MSC_FULL_VER) && _MSC_FULL_VER >= 160040219 // >= VS2010 SP1
- #define xgetbv() _xgetbv(0)
- #elif defined(_MSC_VER) && defined(_M_IX86)
- static WEBP_INLINE uint64_t xgetbv(void) {
- uint32_t eax_, edx_;
- __asm {
- xor ecx, ecx // ecx = 0
- // Use the raw opcode for xgetbv for compatibility with older toolchains.
- __asm _emit 0x0f __asm _emit 0x01 __asm _emit 0xd0
- mov eax_, eax
- mov edx_, edx
- }
- return ((uint64_t)edx_ << 32) | eax_;
- }
- #else
- #define xgetbv() 0U // no AVX for older x64 or unrecognized toolchains.
- #endif
- #if defined(__i386__) || defined(__x86_64__) || defined(WEBP_MSC_SSE2)
- static int x86CPUInfo(CPUFeature feature) {
- int cpu_info[4];
- GetCPUInfo(cpu_info, 1);
- if (feature == kSSE2) {
- return 0 != (cpu_info[3] & 0x04000000);
- }
- if (feature == kSSE3) {
- return 0 != (cpu_info[2] & 0x00000001);
- }
- if (feature == kAVX) {
- // bits 27 (OSXSAVE) & 28 (256-bit AVX)
- if ((cpu_info[2] & 0x18000000) == 0x18000000) {
- // XMM state and YMM state enabled by the OS.
- return (xgetbv() & 0x6) == 0x6;
- }
- }
- if (feature == kAVX2) {
- if (x86CPUInfo(kAVX)) {
- GetCPUInfo(cpu_info, 7);
- return ((cpu_info[1] & 0x00000020) == 0x00000020);
- }
- }
- return 0;
- }
- VP8CPUInfo VP8GetCPUInfo = x86CPUInfo;
- #elif defined(WEBP_ANDROID_NEON) // NB: needs to be before generic NEON test.
- static int AndroidCPUInfo(CPUFeature feature) {
- const AndroidCpuFamily cpu_family = android_getCpuFamily();
- const uint64_t cpu_features = android_getCpuFeatures();
- if (feature == kNEON) {
- return (cpu_family == ANDROID_CPU_FAMILY_ARM &&
- 0 != (cpu_features & ANDROID_CPU_ARM_FEATURE_NEON));
- }
- return 0;
- }
- VP8CPUInfo VP8GetCPUInfo = AndroidCPUInfo;
- #elif defined(WEBP_USE_NEON)
- // define a dummy function to enable turning off NEON at runtime by setting
- // VP8DecGetCPUInfo = NULL
- static int armCPUInfo(CPUFeature feature) {
- (void)feature;
- return 1;
- }
- VP8CPUInfo VP8GetCPUInfo = armCPUInfo;
- #elif defined(WEBP_USE_MIPS32)
- static int mipsCPUInfo(CPUFeature feature) {
- (void)feature;
- return 1;
- }
- VP8CPUInfo VP8GetCPUInfo = mipsCPUInfo;
- #else
- VP8CPUInfo VP8GetCPUInfo = NULL;
- #endif
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